feat: 添加内容创建时间字段，优化内容列表和详情视图；添加创作者内容列表接口；优化上传和删除功能

backend/app/services/content.go

@@ -50,7 +50,7 @@ func (s *content) List(ctx context.Context, filter *content_dto.ContentListFilte
 	case "price_asc":
 		q = q.Order(tbl.ID.Desc())
 	default: // latest
-		q = q.Order(tbl.PublishedAt.Desc())
+		q = q.Order(tbl.ID.Desc())
 	}
 
 	// Pagination
@@ -443,13 +443,14 @@ func (s *content) ListTopics(ctx context.Context) ([]content_dto.Topic, error) {
 
 func (s *content) toContentItemDTO(item *models.Content, price float64) content_dto.ContentItem {
 	dto := content_dto.ContentItem{
-		ID:       cast.ToString(item.ID),
-		Title:    item.Title,
-		Genre:    item.Genre,
-		AuthorID: cast.ToString(item.UserID),
-		Views:    int(item.Views),
-		Likes:    int(item.Likes),
-		Price:    price,
+		ID:        cast.ToString(item.ID),
+		Title:     item.Title,
+		Genre:     item.Genre,
+		AuthorID:  cast.ToString(item.UserID),
+		Views:     int(item.Views),
+		Likes:     int(item.Likes),
+		CreatedAt: item.CreatedAt.Format("2006-01-02"),
+		Price:     price,
 	}
 	if item.Author != nil {
 		dto.AuthorName = item.Author.Nickname

backend/app/services/creator.go

@@ -252,6 +252,7 @@ func (s *creator) ListContents(
 		Items:      data,
 	}, nil
 }
+
 func (s *creator) CreateContent(ctx context.Context, userID int64, form *creator_dto.ContentCreateForm) error {
 	tid, err := s.getTenantID(ctx, userID)
 	if err != nil {